Comparison

Last edited by Cathy.Smith@noaa.gov on Mon, 04/14/2014 - 14:31

Climate Comparisons in the MERRA Atlas

The MERRA Atlas provides monthly, annual, seasonal and climate comparisons among several of the latest atmospheric reanalyses (including ERA-Interim, CFSR, and JRA25) and various global observation datasets.

Reanalysis Comparisons on the WRIT webpages

The NOAA-CIRES Web-based Reanalysis Intercomparison Tools (WRIT) has a prototype plotting/comparison page that is available for testing and commenting by reanalyses.org users and others. To obtain a login to reanalyses.org go to Create New Account.

Observational Studies that examine reanalysis datasets and compare them and observations are described here.

Inter-reanalysis studies that intercompare reanalyses are described here.

Tables:
Reanalyses.org Overview Comparison
ClimateDataGuide Summary and Comparison
Ana4MIPS Data Description

 

Comments (5)

Wind Velocity

I am using wind velocity and I want to calculate it at a height of 80mtrs from the ground . So could you tell me that at what height from the ground these data have been taken????

Re: Wind Velocity

Typically, there is meteorology produced at 2m and 10m above the surface. MERRA produces winds at 50m, and also the lowest model level. the lowest model level does not have a fixed height above the surface, but the geopotential height of the lowest model level is also provided. pressure level wind profile data is also provided, but again, not at a fixed height, geopotential height is provided. 80m is an atypical height for most reanalysis output. In the case of MERRA, you would need the 2 lowest model levels to interpolate to that height. These are available in 3D data files, but, there would be a substantial amount of work to get the interpolated winds.

Another general answer to your question is to read the documentation associated with the reanalysis system that you are using to determine which height the data are at, in case it is not obvious (such as u2m and v2m).

I hope this helps,

Mike Bosilovich (NASA/GMAO)

Re: Comparison

I'm new to this site and have just prepared a page in my own 'area'. After some fiddling around, I seemed to get something going, though will need some fine-tuning as I re-learn Wiki. It deals with an issue regarding some trends in the US Reanalysis data sets and I've obtained some EC data for comparison. Hence it will have some focus on comparison, so I suppose the heading of this thread is apt.

My question is: If I have done the right thing by doing it in my area, how do I get it linked into the main site for others to have a read?

Sorry for troubling you but I sincerely think is an important issue for the folks here to consider.

I warmly appreciate what the site is about and look forward to helping the cause.

Dave

Re: Comparison

Dave, Happy to help. Welcome! Please be very specific when you refer to something. What is "EC data"? This could refer to Environment Canada or sometimes to the European Centre for Medium Range Weather Forecasts. When you are authenticated, look at the Help area. Directions for how to link and how to include images should be there, e.g., https://reanalyses.org/help/how-edit-site Please put Help related comments under the Help area if at all possible. Then the Help pages can themselves be updated as your questions are answered. best wishes, gil compo

Re: Comparison

To answer the question about the link, it should probably be linked from here https://reanalyses.org/atmosphere/inter-reanalysis-studies-0 On there top bar, there is a help link. If you click it, it tells you how to a) create the page and b) link to it. If you have problems, comment and we will try to help/improve directions. Cathy

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